Doroshenko, Igor, Andrii Svatyev, Eduard Sobol, Sviatoslav Danylchenko, and Eduard Doroshenko. 2023. “Parameters of Physical Performance of Qualified Football Players in the Preparatory Period of Training”. Journal of Learning Theory and Methodology 4 (1). Kharkiv, Ukraine:26-32. https://doi.org/10.17309/jltm.2023.4.04.